Year % 2002 9.8674684559535 2003 12.499312971854744 2004 16.962756234363 2005 15.153985134343184 2006 13.681958215526555 2007 18.779176181544653 2008 21.456723919221094 2009 25.44595510811596 2010 22.89557096765368 2011 14.33255415297315 2012 10.697179613000241 2013 17.51593096515706 2014 31.138084534228998 2015 33.30321134174116 2016 21.407021366058636 2017 23.08813402848612 2018 21.21366239492984 2019 18.861152165486757 2020 17.378412992006062 2021 23.930344172569377 2022 20.68218336442023 2023 21.875506135068672